Game runs fine and smooth through levels up until the end when it displays your scores. There's a high pitch noise, probably used when it's displaying the text on how well you did while playing, but it continues even when the game has finished typing. It's very high pitched and louder than the rest of the game so I have to turn down my volume upon beating a level. It goes away when the game saves between levels. I also noticed the distortion sometimes in levels where I miss a long purple stream and it gets sucked into whatever is chasing me (sorry, can't remember the names of them) like on Pluto level 7 (The End?). It always lasts until the game saves. When playing the demo when I got to the end of it and it asked me to purchase the game it continued until I quit the game.

I'm experiencing the same. The singularity sound becomes very grating when it absorbs waveform, and the screeching score tally sound at the end of the level is quite unpleasent. I think it might be how it's using Pulseaudio. I'm using Fedora 17, absolutely vanilla sound drivers, and prefer headphones.

I've gotten somewhat used to it. It's annoying, yes, but it is hardly as annoying as it was when I first started playing. But the moment it absorbs a waveform and I have any bass enabled, my house shakes.